Green Algae
Brown Algae
Did You Know?
Red Algae
100

Brilliant white when bleached in sun.

What is cactus algae?

100

Turns dark brown on beach.

What is pelagic sargassum?

100

Have bitter chemicals that discourage grazing by fish

What is iridescent-banded algae?

100

Where branching coralline algae grows?

What is shallow seagrass beds?

200

Also known as bubble algae

What is Sailor’s Eye?

200

Has air-filled bladders on its longest branches

What is attached sargassum?

200

Provides a life raft for hundreds of marine animal species

What is sargassum?

200

Its branch tips usually end in sickle hooks

What is hypnea?

300

Forms a domed clump in water

What is green fleece?

300

Largely disappears in cold months

What is dictyota?

300

A toxic alien species of this green seaweed invaded the Mediterranean Sea.

What is caulerpa?

300

When alive, this alga is pale lavender.

What is branching coralline algae?

400

Has pale yellow rhizomes and stubby branchlets

What is grape caulerpa?

400

Recognized by its bubble-ball appearance

What is balloon seaweed?

400

When pulverized, this seaweed makes up most of the white beach in the Keys

What is cactus algae?

400

Has pale-pink branchlets

What is spiny seaweed?

500

A calcareous algae, along with cactus algae

What is shaving brush algae?

500

Contains air in its pyramid-shaped fronds

What is three-cornered hat algae?

500

Has photosynthetic pigment that absorbs blue light

What is red algae?

500

Red algae is somewhat related to this other kind of algae

What is green algae?